Gas-burner



J. MILLER.

GAS BURNER.

APPLICATION FILED APR. 8, 1920.

Patented July 5 1921.;

2 SHEETS-SHEET I sama a proved means for delivering the gas to the ETD TJOE MILLER, 01 LITTLE ROCK, ARKANSAS.

Specification of Letters Patent.

GAS-BURNER.

Patented July 5, 1921.

Application filed April 8,1920. Serial No. 372,204.

I of the United States, resident of Little Rock,

county of Pulaski, State of Arkansas, have invented certain new anduseful Improvements in Gas-Burners, of which the followin is aspecification.

y invention relates to burners designed particularly for handlingnatural gasand the object of the inventionis to provide imburner andfurther to provide means for equalizing the delivery of air to theburners to the end that combustion of the gas at the nozzle will becomplete and uniform.

Other objects of the invention will appear from the following detaileddescription.

The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is a vertical sectional view, taken on the section line 11 ofFig. 2.

Fig. 2 is an end elevation of the apparatus applied to the front of aboiler.

Fig. 3 is a sectional view on the line 3-3 of Fig. 1,

Fig. 4 is an end view of one of theburners,

Fig. 5 is a sectional view on the-line 5-5 of Fig. 4,

In the drawing, 2 represents a boiler of the horizontal type, having theusual setting 3 and front 4. 5 is the combustion chamber beneath theboiler. A casting 6 is mounted in ?the boiler front and provided with aseries of openings 7 separated from each other by webs 8. A box orcasing 9 is mounted at one end in the front of the boiler and encirclesthe fire brick 6. This box is perfectly rectangular in cross section,the top and bottom and side walls being secured to the fire bricks 6 byany suitable means,

such as bolts 10. At the outer end of the box I provide gas chambers 11and 11 arranged at the top and bottom of the box 9 and supported bysuitable means, such as legs 12. These chambers extend the full width ofthe box 9 and have pipe connections 13 and 14 with a suitable supply ofnatural gas, the device being intended for burning this kind of fuel.

As shown in Fig. 3, I provide a series of the openings 7 in the front oftheboiler and pipes 15 and 16 and 15* and 16 communicate respectivelywith the gas chambers 11 and 11 and extend forwardly therefrom to pointsnear the openings in the Wall 6. These pipes deliver the gas in uniformvolume from the chambers and on the end of each pipe is mounted acylindrical nozzle 17, preferably by threading the pipe and tapping thenozzle. The nozzle is cupshaped inform and is provided with a centralport 18 and a series of similar ports 19 grouped around. the centralport and inclined outwardly therefrom and positioned near the opening 7in the fire brick, sufficient space being provided around the nozzle toadmit currents of air to mix with the gas andproduce a perfectcombustion within the firebrick opening and near the gas nozzles. Thepurpose of this is to decrease the rapidity of flow of the gas throughand under the boiler and thereby effect a greater economy in theconsumption of gas and a 'larger degree of heat from such consumption.It will be noted that the openings 7 in the firebrick gradually increaseincross sectional area from their'outer toward their inner ends, therebyincorporating the principle of a Venturi tube. When a hole is providedadjacent a gas nozzle nd embody- 1ng this principle, should there be anyvariation in the quantity of gas, the difference between the gaspressure and the atmospheric pressure. increases in proportion to thedifference in the squares of the former and new velocities, the'fiow ofgas through an orifice being proportional to the square root of thepressure difference. The air drawn in by the suction will vary directlywiththe gas flow and once adjusted, the rate of gas and air is constant.By givin the gas a flare from a straight line through the nozzle, themixture of air and gas is more rapid and combustion takes place nearerto the end of the burner proper.

To regulate the delivery of air to the burner, and insure an equaldistribution to all of them, I provide a series of shutters 20 mounted.in an opening 21 between the gas chambers 11 and 11 and having shafts 22journaled in the side walls of the box and provided with cranks 23connected by a vertlcal rod 24 which is threaded at 25 and is mounted ina bracket 26 on the gas cham- 'ber 11. A Wheel 27 is mounted on the rod24 by means of which the rod is raised or lowered to open or close theshutters or dampers and regulate the flow of airfto the burners.

The advantage of this arrangement of dampers is that air willbe admitteduniformly to follow the pipes leading to all. the burners. The pipes inthe center receive the same volume of air as those adjacent the walls ofthe box.

With this apparatus the gas is admitted to the box in. front of theboiler from the chambers extending across the top and bottom of the box,the arrangement of-the pipes being such that the gas from thecorresponding burners travels substantially a uniform distance and theair being admitted through an opening of substantially the' neath theboiler, will contact with the ex-- posed surface thereof at all points.

I claim as my invention:

1. The combination, with a boiler front, of a burner brick settingmounted therein and provided with a series of holes increasing in crosssectional area from their outer toward their inner ends, pipes and gasnozzles therefor terminating adjacent the outer ends of "said opening,said nozzles having flaringly arranged ports therein for directing thegas toward the walls of said openings, and means for delivering currentsof air. to pass through said openings around said nozzles.v

2. The combination, with a boiler vfront having anopening therein, of agas nozzle terminating near the outer end of said open- 1 ing andprovided with a series of flaringly arranged ports therein and means forsupplying currents of air to said opening around said nozzle.

3. The combination, with a boiler front having a wall composed ofrefractory mateterial-and a series ofopenings there1n,-of a boxprojecting outwardly from said Wall and encircling said openings, gaspipes arranged within said box and terminating opposite eeann and nearthe outer ends of said openings and having nozzles for directing the gasinto and through said openings, and a series of shutters provided in theouter portion of said box for delivering currents of air uniformly tosaid-pipes and holes.

4'. The combination, with \a boiler front having a plurality of openingstherein, of a series of gas nozzles mounted adjacent to said openingsand having a plurality of flaringly arranged ports therein for directingthe gas toward the walls of said openings, and means for supplying airto said openings around said nozzles.

5. The combination, with a boiler front, of a wall'of refractorymaterial mounted therein provided with a series of Openings, of a. boxencircling said wall and openings and projecting outwardly therefrom,gas chambers mounted upon opposite sides of said box at the outerportion thereof and having pipes for communication with a gas supply,pipes leading from said gas chamber and extending through said box andhaving nozzles terminating opposite and near the openings in saidrefractory wall, the end wall of said box between said gas chambersbeing open and a series of shutters mounted therein for regulating theuniform flow of air to said box and through said nozzles.

6. The combination, with a boiler front, of a burner setting mountedtherein and provided with a series of openings, a box encircling saidopenings and projectingoutwardly therefrom, gas chambers mounted on theouter opposite walls of said box, pipes Ileading from said chambers andhaving gas nozzles terminating near said openings respectively and saidbox having an air intake opening for said nozzles between said gaschambers. t

7. The combination, with a. boiler front, of a burner setting mountedtherein and pro- .vided with a series of openings, a box fitting oversaid openings and projecting outwardly therefrom, a gas chamber arrangedon the walls of said box, pipes leading from said gaschamber andextending to a point near said openings and having nozzles fordischarging gas through said openings and said box having an air intakeopening in its outer'walls and adjacent the outer ends of said pipes fordelivering air to flow around said pipes and mingle with the gasdischarged from said nozzles.

8. The combination, with a boiler front, of a burner brick settingmounted therein and provided with a series of openings, pipes and gasnozzles therefor terminating adjacent the outer ends of saidopenings-"said nozzles having flaringly arranged ports therein fordirecting the gas toward the walls -of said openings, and means fordelivering currents of air to pass through said openings around saidnozzles.

9. The combination, with a boiler front, ing through said box and havingnozzles ter- 10 of a wallof refractory material mountedminating'opposite and near the openings in therein provided with aseries of openings, said refractory wall, the end wall of said 'a boxencircling said wall and openings and box between said gas chambersbeing open 5 projecting outwardly therefrom, gas chamto admit air tosaid nozzles.

bers mounted upon opposite sides of said box In witness whereof, I havehereunto set 15 at the outer portion thereof and having pipes my handthis 8th day of Match, 1920. for communication with a gas supply, pipesleading from said gas chambers and extend- JOE MILLER.

